Electrostatics — Physics STD 12 Science — Question

A vertical wire carries a current in upward direction. An electron beam sent horizontally towards the wire will be deflected:

The zone in a semiconductor diode where no free charge carriers exists is known as the:

If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is(a) 25 : 16(b) 5 : 3(c) 16 : 1 (d) 25 : 9

When the intensity of light falling on a surface producing photoelectric effect is doubled, then :

Particles which can be added to the nucleus of an atom without changing its chemical properties are called:

A positive charge is moving vertically upwards in the magnetic field towards the south. In which direction will it be deflected?

Assertion : Only microwaves are used in radar.
Reason    : Because microwaves have very small wavelength.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.